Portion of a ground fault interrupter



FIG. 1 is a front, bottom and right side perspective view of the design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a front, bottom and right side perspective view of the design in combination with a wall plate.

In all of the views, the dotted lines are for environmental purposes only and form no part of the claimed design. The rear is not part of the claimed design. 

The ornamental design for a portion of a ground fault interrupter, as shown and described. 